Early in fighter pilot training, they put us through all kinds of disorienting exercises—like the Barany chair, which spins you blindfolded to test your balance and spatial awareness. But the real wake-up call is the altitude chamber: you drop your oxygen mask at 25,000 feet and try to solve a puzzle while hypoxic. You think you're fine… until the oxygen kicks back in and you realize you were just scribbling. #Military | Shawn Walsh